package org.test.algorithm;

import java.util.*;

/**
 * 禁忌算法（Tabu Search，简称TS）
 */
public class TabuSearch {
    private Solution initialSolution;
    private int tabuTenure; // 禁忌长度
    private int maxIterations; // 最大迭代次数
    private List<Solution> tabuList; // 禁忌表
    private Evaluator evaluator; // 评估器，用于计算目标函数值

    public TabuSearch(Solution initialSolution, int tabuTenure, int maxIterations, Evaluator evaluator) {
        this.initialSolution = initialSolution;
        this.tabuTenure = tabuTenure;
        this.maxIterations = maxIterations;
        this.tabuList = new ArrayList<>();
        this.evaluator = evaluator;
    }

    public Solution search() {
        Solution currentSolution = initialSolution;
        tabuList.add(currentSolution);

        for (int iteration = 0; iteration < maxIterations; iteration++) {
            List<Solution> candidateSolutions = generateCandidateSolutions(currentSolution);
            Solution bestSolution = null;
            double bestValue = Double.MAX_VALUE;

            for (Solution candidate : candidateSolutions) {
                if (!isTabu(candidate)) {
                    double value = evaluator.evaluate(candidate);
                    if (value < bestValue) {
                        bestValue = value;
                        bestSolution = candidate;
                    }
                }
            }

            if (bestSolution == null) {
                // 如果所有候选解都被禁忌，则选择禁忌解中最好的一个
                bestSolution = candidateSolutions.stream()
                        .min(Comparator.comparingDouble(evaluator::evaluate))
                        .orElse(null);
            }

            currentSolution = bestSolution;
            updateTabuList(currentSolution);
        }

        return currentSolution;
    }

    private List<Solution> generateCandidateSolutions(Solution currentSolution) {
        // 生成候选解的方法，具体实现依赖于问题
        List<Solution> candidates = new ArrayList<>();
        // 添加一些候选解到列表中
        return candidates;
    }

    private boolean isTabu(Solution solution) {
        return tabuList.contains(solution);
    }

    private void updateTabuList(Solution solution) {
        if (tabuList.size() == tabuTenure) {
            tabuList.remove(0); // 移除最早加入的解
        }
        tabuList.add(solution);
    }

    // 内部类或接口定义
    public static interface Solution {
        // 定义Solution类的属性和方法，如equals和hashCode方法用于禁忌表检查
    }

    public static interface Evaluator {
        double evaluate(Solution solution); // 计算目标函数值
    }

    public static void main(String[] args) {
        // 示例使用
        Solution initialSolution = new Solution() { /* 实现Solution接口 */ };
        Evaluator evaluator = new Evaluator() {
            @Override
            public double evaluate(Solution solution) {
                // 实现目标函数值的计算
                return 0.0;
            }
        };

        TabuSearch tabuSearch = new TabuSearch(initialSolution, 10, 100, evaluator);
        Solution bestSolution = tabuSearch.search();
        System.out.println("Best Solution: " + bestSolution);
    }
}